Work package means a major sub-division of the proposed project. Deliverable means a distinct output of the project, meaningful in terms of the project's overall objective. It can be a report, a document, a technical diagram, a piece of software etc.Milestones are control points to help to chart your progress. Milestones may correspond to the completion of a key deliverable. They may also correspond to other inputs, allowing the next phase to begin, to decide on further steps or to take corrective measures.